[SOLVED] Asus ROG STRIX B450-F, no boot or POST, not recognizing USB connections

[kingwfu]

Good evening, all. After assembling, my PC would not recognize the monitor when plugged into the HDMI port in the mobo and the GPU, as well as the keyboard or mouse when plugged in the rear USB ports on the mobo or the front panel. I had challenges getting the stock heat sink/cooler on, so the thermal compound pre applied to the CPU was smeared around a bit on the CPU. I’m trying to rule out the CPU seating as being the cause, but I’m wondering if it’s related to the USB connectors from the case to the mobo. Any troubleshooting suggestions would be appreciated!

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CPU	AMD Ryzen 7 2700X 3.7 GHz 8-Core Processor
Motherboard	Asus ROG STRIX B450-F GAMING ATX AM4 Motherboard
Memory	Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory
Storage	Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive SanDisk Ultra 512GB Internal SSD
Video Card	MSI GeForce GTX 1660 6 GB VENTUS XS OC Video Card
Case	Aerocool Cylon ATX Mid Tower Case
Power Supply	EVGA BQ 600 W 80+ Bronze Certified Semi-modular ATX Power Supply
Operating System	Microsoft Windows 10 Home OEM 64-bit
Monitor	Acer SB220Q bi 21.5" 1920x1080 75 Hz Monitor
Keyboard	Redragon K561 VISNU Wired Gaming Keyboard
Mouse	SteelSeries Rival 310 Wired Optical Mouse

 

[kingwfu]

We ended taking it to a repair shop and found the following:

1. we’d left off a power cord to the mobo, which is why the USB’s didn’t work
2. the monitor did not work with the mobo or GPU, so we’ll have to return it.

Otherwise, rest of the assembly was good. Glad that it was resolved because the boy was amp’d to get playing last night, and it was discouraging not for him to be able to. Now, hopefully, he’ll become interested in DIY.